MPLAYER在片段

Question

你好，我有一些truble在我的片段添加MdiaPlayer但我现在thnik将wirk我需要1个拉特的事情了，因为我的代码：private MediaPlayer的MPLAYER = NULL;是“空”，我现在不需要把这个行的（）的mPlayer = new MediaPlayer（）;如果有人能帮助我很多。

public class thekairi78 extends Fragment implements OnClickListener{ 

    View v; 
    Button france2; 
    private MediaPlayer mPlayer = null; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     v = inflater.inflate(R.layout.thekairi78, container, false); 

     france2 = (Button) v.findViewById(R.id.france2); 
     france2.setOnClickListener(this); 

     mPlayer = new MediaPlayer(); 


     return v; 
     } 





    private void playSound(int resId){ 
     if (mPlayer != null) { 
      mPlayer.stop(); 
      mPlayer.release(); 

     } 
     mPlayer = MediaPlayer.create(getActivity(), resId); 
     mPlayer.start(); 
    } 

    @Override 
    public void onPause() { 
     if(mPlayer != null && mPlayer.isPlaying()){ 
      mPlayer.pause(); 
     } 
     super.onPause(); 

    } 
    @Override 
    public void onClick(View v) { 

     switch (v.getId()) { 
      case R.id.france2: 
       playSound(R.raw.france1); 
       break; 



     } 

    } 
} 

Answer 1

变化

这条线从

mPlayer=new MediaPlayer()

到

MPLAYER = MediaPlayer.create（getActivity（），R.raw.sample_song）;

Answer 2

试试这个班，这对我来说

import android.content.Intent; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.media.MediaPlayer; 
import android.os.Handler; 
import android.widget.Button; 
import android.widget.ImageButton; 
import android.widget.SeekBar; 
import android.widget.TextView; 

import com.example.prolab2.learn_android.Activitys.Activity_Info; 
import com.example.prolab2.learn_android.R; 

import java.util.concurrent.TimeUnit; 



public class Fragment_Audio extends Fragment implements View.OnClickListener 
{ 

public Fragment_Audio(){ 
} 
private MediaPlayer mediaPlayer; 
public TextView songName, duration; 
ImageButton btn_play, btn_pause, btn_forward, btn_rewind; 
Button btn_audio_player_show; 
private double timeElapsed = 0, finalTime = 0; 
private int forwardTime = 2000, backwardTime = 2000; 
private Handler durationHandler = new Handler(); 
private SeekBar seekbar; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.fragment_audio, container, false); 

    btn_audio_player_show = (Button) view.findViewById(R.id.btn_audio_player_show); 
    btn_audio_player_show.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent intent = new Intent(getActivity(), Activity_Info.class); 
      intent.putExtra("Buttons_id", v.getId()); 
      startActivity(intent); 
     } 
    }); 

    songName = (TextView) view.findViewById(R.id.songName); 
    btn_forward = (ImageButton) view.findViewById(R.id.media_ff); 
    btn_play = (ImageButton) view.findViewById(R.id.media_play); 
    btn_pause = (ImageButton) view.findViewById(R.id.media_pause); 
    btn_rewind = (ImageButton) view.findViewById(R.id.media_rew); 

    btn_forward.setOnClickListener(this); 
    btn_play.setOnClickListener(this); 
    btn_pause.setOnClickListener(this); 
    btn_rewind.setOnClickListener(this); 

    mediaPlayer = MediaPlayer.create(getActivity(), R.raw.sample_song); 
    finalTime = mediaPlayer.getDuration(); 
    duration = (TextView) view.findViewById(R.id.songDuration); 
    seekbar = (SeekBar) view.findViewById(R.id.seekBar); 
    songName.setText("Sample_Song.mp3"); 

    seekbar.setMax((int) finalTime); 
    seekbar.setClickable(false); 

    return view; 
} 

// play mp3 song 
public void play() { 
    mediaPlayer.start(); 
    timeElapsed = mediaPlayer.getCurrentPosition(); 
    seekbar.setProgress((int) timeElapsed); 
    durationHandler.postDelayed(updateSeekBarTime, 100); 
} 

//handler to change seekBarTime 
private Runnable updateSeekBarTime = new Runnable() { 
    public void run() { 
     //get current position 
     timeElapsed = mediaPlayer.getCurrentPosition(); 
     //set seekbar progress 
     seekbar.setProgress((int) timeElapsed); 
     //set time remaing 
     double timeRemaining = finalTime - timeElapsed; 
     duration.setText(String.format("%d min, %d sec", TimeUnit.MILLISECONDS.toMinutes((long) timeRemaining), TimeUnit.MILLISECONDS.toSeconds((long) timeRemaining) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) timeRemaining)))); 

     //repeat yourself that again in 100 miliseconds 
     durationHandler.postDelayed(this, 100); 
    } 
}; 

// pause mp3 song 
public void pause() { 
    mediaPlayer.pause(); 
} 

// go forward at forwardTime seconds 
public void forward() { 
    //check if we can go forward at forwardTime seconds before song endes 
    if ((timeElapsed + forwardTime) <= finalTime) { 
     timeElapsed = timeElapsed + forwardTime; 

     //seek to the exact second of the track 
     mediaPlayer.seekTo((int) timeElapsed); 
    } 
} 

// go backwards at backwardTime seconds 
public void rewind() { 
    //check if we can go back at backwardTime seconds after song starts 
    if ((timeElapsed - backwardTime) > 0) { 
     timeElapsed = timeElapsed - backwardTime; 

     //seek to the exact second of the track 
     mediaPlayer.seekTo((int) timeElapsed); 
    } 
} 

@Override 
public void onClick(View v) { 
    switch(v.getId()){ 
     case R.id.media_ff: 
      forward(); 
      break; 

     case R.id.media_play: 
      play(); 
      break; 
     case R.id.media_pause: 
      pause(); 
      break; 

     case R.id.media_rew: 
      rewind(); 
      break; 
    } 
} 
}